linux-kernel - Re: [PATCH v2 1/2] drm: Add DRM_GEM

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Message-ID: <34aacfa3-9eb9-d3d5-07b7-805fd1408bb7@suse.de>
Date:   Tue, 7 Jun 2022 08:56:39 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Rob Clark <robdclark@...omium.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] drm: Add DRM_GEM_FOPS

Hi

Am 06.06.22 um 21:54 schrieb Rob Clark:
> From: Rob Clark <robdclark@...omium.org>
> 
> The DEFINE_DRM_GEM_FOPS() helper is a bit limiting if a driver wants to
> provide additional file ops, like show_fdinfo().
> 
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>   include/drm/drm_gem.h | 26 ++++++++++++++++++--------
>   1 file changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index 9d7c61a122dc..dc88d4a2cdf6 100644
> --- a/include/drm/drm_gem.h
> +++ b/include/drm/drm_gem.h
> @@ -314,6 +314,23 @@ struct drm_gem_object {
>   	const struct drm_gem_object_funcs *funcs;
>   };
>   
> +/**
> + * DRM_GEM_FOPS - Default drm GEM file operations
> + *
> + * This macro provides a shorthand for setting the GEM file ops in the
> + * &file_operations structure. 

I would appreciate a reference to DEFINE_DRM_GEM_FOPS. Something along 
the lines of 'if all you need are the default ops, use DEFINE_DRM_GEM_FOPS'.

> + */
> +#define DRM_GEM_FOPS \
> +	.open		= drm_open,\
> +	.release	= drm_release,\
> +	.unlocked_ioctl	= drm_ioctl,\
> +	.compat_ioctl	= drm_compat_ioctl,\
> +	.poll		= drm_poll,\
> +	.read		= drm_read,\
> +	.llseek		= noop_llseek,\
> +	.mmap		= drm_gem_mmap
> +
> +

Only one empty line please.

>   /**
>    * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers
>    * @name: name for the generated structure
> @@ -330,14 +347,7 @@ struct drm_gem_object {
>   #define DEFINE_DRM_GEM_FOPS(name) \
>   	static const struct file_operations name = {\
>   		.owner		= THIS_MODULE,\

Is there a specific reason why .owner is still set here? I suspect that 
DRM_GEM_FOPS is strictly for callback functions?

In any case

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

Best regards
Thomas

> -		.open		= drm_open,\
> -		.release	= drm_release,\
> -		.unlocked_ioctl	= drm_ioctl,\
> -		.compat_ioctl	= drm_compat_ioctl,\
> -		.poll		= drm_poll,\
> -		.read		= drm_read,\
> -		.llseek		= noop_llseek,\
> -		.mmap		= drm_gem_mmap,\
> +		DRM_GEM_FOPS,\
>   	}
>   
>   void drm_gem_object_release(struct drm_gem_object *obj);

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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